S6 Brazing. in proportions, the following percentages being- : Copper . . . ... ... ° 3 Tin ... ......... -. 84 9° Antimony ... .. ... 8 7 TOO IOO of white metal for bearings is that it can be run the the journal is in place, and so ensure a- fit. It causes considerably less friction than brass or To sum up then, alloys of copper and tin are termed bronzes, and a little zinc added up to about i \ or 3 per cent. of and 2inc are called brasses, Muntz metal being one of ; and those having tin and antimony, with a little are metals. ^ Brazing.Brass or gun metal may be united by this process, is also termed hard soldering; and the joint will then be as as the original casting. or steel may be also connected by brazing if more especially finished pieces of work. The method is to first clean the work with acid, then take some brass mix with powdered borax as a flux, the borax being moistened with water.* The filings are placed between the to be braced so as to form a joint, as much surface for the latter as possible, and the two are held together in tongs, having thick jaws to keep the heat. The tongs will the and grip the pieces until perfectly set,- and the be finished off in the vice. If the work cannot be easily gripped, another way is to insert the as before, and, binding with iron wire, place the' pieces ' in a coke fire until the operation is complete. Or, still another method is to use the blow-pipe. Here a fine of very hot is directed on to the work by blowing with' this instrument through a lighted 'Bunsen.' * * ge&omfy^ Instead of brass Slings, 'spelter* is used, which' is a about equal parts of copper and zinc, and specially' ft* bntafug pturposes* . ... :- '